5.2 b: Application
YASKAWA ELECTRIC
SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual
107
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• Using Control Circuit Terminal A2 (0/4 to 20 mA current input)
Connect input A2 to an external current source such as the one shown in
. Make sure that switch S1 is set
to “I” and set the appropriate signal level for terminal A2 by entering 2 (4 to 20 mA) or 3 (0 to 20 mA) into parameter
H3-09. The terminal A2 function must be set to frequency bias by entering 0 into parameter H3-10 (
Terminal A2 Function Selection on page 180
).
Figure 5.2
Figure 5.2 Setting the Frequency Reference by Current Input
Switching between Main/Auxiliary Frequency References
The frequency reference input can be switched between terminal A1 (main) and terminal A2 (auxiliary). When using this
function:
• Make sure that b1-01 is set to “1” (Frequency reference from analog input terminal A1, A2).
• Set the terminal A2 function to auxiliary frequency (H3-10 = 2).
• Set one digital input to multi-speed 1 (H1-
= 3, default for S5).
The frequency reference value is read from
• Terminal A1 when the digital input set for multi-speed 1 is open.
• Terminal A2 when the digital input set for multi-speed 1 is closed.
shows a wiring example for main/auxiliary reference switching using digital input S5.
Figure 5.3
Figure 5.3 Switching between Analog Reference 1 and 2
Setting 2: MEMOBUS/Modbus Communications
This setting requires that the frequency reference is entered via the RS-485/422 serial communications port (control
terminals R+, R-, S+, S-, Protocol: MEMOBUS/Modbus). For instructions,
Drive
A1
A2
Frequency reference
Frequency reference bias
AC
Analog common
+V (+10.5 V, 20 mA power supply)
0 or 4 to 20 mA input
DIP switch S1
V
I